Jahn-Teller Effect in Copper-Doped Spinel Group V. A. Shapovalov, H. Szymczak, S. Piechota et V. V. ShapovalovJ. Phys. IV France, 07 C1 (1997) C1-243-C1-244DOI: https://doi.org/10.1051/jp4:1997193